Improvement in cranes



1. D0 R M A N".

Mane.

Patented March 9, H175.

THE GRAPHIC C0.PHOTOrLITH-39&4I PARK PLAOEJLY.

T FFIC.

ATE

JERRY DOBMAN, OF GEORGETOWN, DISTRICT OF COLUMBIA.

IMPROVEMENT lN CRANES.

Specification forming part of Letters Patent No. 160,5 l 3, dated March9, 1875; application filed February 20, 1875.

To all whom it may concern Be it known that I, JERRY DORMAN, ofGeorgetown, in the county of Washington and District of Columbia, haveinvented certain new and useful Improvements in Cranes; and I do herebydeclare that the following is a full, clear, and exact descriptionthereof, which will enable others skilled in the art to which itpertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of reference marked thereon,which form a part of this specification.

Figure 1 is a side elevation of the crane, with one arm removed to showthe arrangement of the cords, traveler, and pulleys. Fig. 2 is a topview, and Fig. 3 details and crosssections on line 00 as of Fig. 1.

A is a mast, upon which the arms and axleframe are securely fastened,and which is properly bedded in the wharf or other foundation, andbraced so that it will be always in a vertical position. B B are twoarms extending from the mast, and placed at such a distance apart as toaccommodate the sheave D, which carries the proper pulley e for operating the hoisting apparatus, as also turning pulleys b and b. O O is aframe for the support of the pulley b and axle b, to which are suspendedthe actuating counter-weight G and the cord 2 for operating the travelerD inwardly. D is a traveling-car, to which is suspended the coal-bucketH by cord No. 1. d d represent flanged truck-wheels, (one only seen inFig. 1; but two such may be used, as in the modification of D, Fig. 3,)which travel on top of the arms B B. d d are plain wheels under the armsto act as friction-wheels. In D is a pulley, 0, over which cord No. 1 iscarried down to the coal-bucket. E is a spirallygrooved drum supportedin a proper frame, 6 e, and is worked either by a handle or upon ashaft, upon which may be as many similar drums as there are cranes to beoperated, in which event each drum is to be thrown into or out of gearby a friction-clutch in the usual manner, each drum having a properratchet, e, and pawl f. F is the frame supporting the pawl f attached. Gis a weight supported by cord N o. 3 to the axle b in the frame 0 O. His the coal-bucket supported by cord No. 1, which passes over pulley c,thence under and over pulley b at the outer end of arms B B, thence tothe pulley a in top of the mast A, and down to drum E. Traveling-car Dhas a loop on the inner end, to which is fastened cord No. 2, whichpasses over pulley b, and thence down to pulley b, and on which it iswound around and secured. Axle b has secured to it a cord No. 3, whichsupports the weight G. There is a friction-brake, c, with handle 0, bywhich the axle b may be held to suspend the weight G, or to prevent itselevation.

In practice the brake is so arranged that it is held in action normally,and the attendant releases it by placing his foot upon a treadle. Thisis not shown in the drawing, but may be employed in connection with thisapparatus.

The operation of this device :is as follows: The weightGis heavier thanthe empty bucket H, but much lighter than the bucket when loaded. Now,when the coal is to be lifted and carried outwardly, the cord No. 1,being operated by the drum E acting over pulleys a. and b, will elevatethe bucket by acting also over pulley e in the traveling-car D, which,being free to move, will be pulled, in direction of the arrow, towardpulley b, as seen in Fig. 1 at H, and at the same time the cord No. 1will elevate bucket H to its position at H, and as cord N0. 2 isattached to car D, and acting over pulley I) will unwind itself frompulley b', and wind around axle b cord No. 3, and pull up weight G. Theproportion between the diameters of pulley b and axle b,weight G, anddistance to which car D is to be moved horizontally outward, and theheight to which weight G is to be elevated, are so determined as toeconomize power, according to the position and purposes for which thecrane is to be employed. The weight of bucket H when loaded, and whenpulled outwardly, draws up weight G, and stores up therein a power whichwill act inwardly, and draw the bucket back when the load has beendischarged. This arrangement of traveling car and weight facilirates theoperation of loading or unloading two or more vessels which are placedside by side.

Having described my invention, what I claim 1s 1. In a crane forhoisting coal and other materials, a winding-drum, cords and pulleys,traveling-car and counter -weight, arranged, substantially asdescribed,to elevate the loaded bucket, and its outward movement shallelevate the weight, which will retract the car when the bucket isemptied.

2. The combination of the traveling-car D, cords 2 and 3, pulleys b b,and axle b, and weight G, substantially as and for the purposedescribed.

In testimony that I claim the foregoing as my own invention I affix mysignature in presence of two witnesses.

JERRY DORMAN. Witnesses:

W. R. SINGLETON, O. M. OoNNELL.

